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derp: use new net/tcpinfo package

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Updates #8413

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I8bf8046517195a6d42cabb32d6ec7f1f79cef860
This commit is contained in:
Andrew Dunham
2023-06-22 13:01:26 -04:00
parent d9eca20ee2
commit ab310a7f60
4 changed files with 11 additions and 16 deletions
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24
derp/derp_server_linux.go
View File

@@ -9,19 +9,18 @@ import (
"net"
"time"
"golang.org/x/sys/unix"
"tailscale.com/net/tcpinfo"
)
func (c *sclient) statsLoop(ctx context.Context) error {
// If we can't get a TCP socket, then we can't send stats.
tcpConn := c.tcpConn()
if tcpConn == nil {
// Get the RTT initially to verify it's supported.
conn := c.tcpConn()
if conn == nil {
c.s.tcpRtt.Add("non-tcp", 1)
return nil
}
rawConn, err := tcpConn.SyscallConn()
if err != nil {
c.logf("error getting SyscallConn: %v", err)
if _, err := tcpinfo.RTT(conn); err != nil {
c.logf("error fetching initial RTT: %v", err)
c.s.tcpRtt.Add("error", 1)
return nil
}
@@ -31,23 +30,16 @@ func (c *sclient) statsLoop(ctx context.Context) error {
ticker := time.NewTicker(statsInterval)
defer ticker.Stop()
var (
tcpInfo *unix.TCPInfo
sysErr error
)
statsLoop:
for {
select {
case <-ticker.C:
err = rawConn.Control(func(fd uintptr) {
tcpInfo, sysErr = unix.GetsockoptTCPInfo(int(fd), unix.IPPROTO_TCP, unix.TCP_INFO)
})
if err != nil || sysErr != nil {
rtt, err := tcpinfo.RTT(conn)
if err != nil {
continue statsLoop
}
// TODO(andrew): more metrics?
rtt := time.Duration(tcpInfo.Rtt) * time.Microsecond
c.s.tcpRtt.Add(durationToLabel(rtt), 1)
case <-ctx.Done():